Why do we need interface in Java. Instead of interface we can write the methods in the class itself. - Java don't support Multiple Inheritance. For that we can use Interface. Interface is like the getway to comunicate between to classes. Not always we write methods in Interface, we can also create objects in the Interface. The Object which will be shared between two classes can be created in an Interface. Creating Seperate Interface is one of the key factor of Software Engineering. Suppose Class "A" has many methods depends on several Classes' objects. Think that, one method creates connection depends on Class B object and another method makes business rules depending on Class C object. In this situation, you can actually use to Seperate Interface for better performence.

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Question: Why do we need interface in Java. Instead of interface we can write the methods in the class itself. Why do we need seperate interface?

Answer: Java don't support Multiple Inheritance. For that we can use Interface.

Interface is like the getway to comunicate between to classes.

Not always we write methods in Interface, we can also create objects in the Interface. The Object which will be shared between two classes can be created in an Interface.

Creating Seperate Interface is one of the key factor of Software Engineering. Suppose Class "A" has many methods depends on several Classes' objects. Think that, one method creates connection depends on Class B object and another method makes business rules depending on Class C object. In this situation, you can actually use to Seperate Interface for better performence.

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Question: Why do we need interface in Java. Instead of interface we can write the methods in the class itself. Why do we need seperate interface?

Answer:

Java don't support Multiple Inheritance. For that we can use Interface.

Interface is like the getway to comunicate between to classes.

Not always we write methods in Interface, we can also create objects in the Interface. The Object which will be shared between two classes can be created in an Interface.

Creating Seperate Interface is one of the key factor of Software Engineering. Suppose Class "A" has many methods depends on several Classes' objects. Think that, one method creates connection depends on Class B object and another method makes business rules depending on Class C object. In this situation, you can actually use to Seperate Interface for better performence.
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